Like, sometimes you have to deal with all the social pleasantries that occur when a character enters or leaves a scene. I bet you don't want a quarter of a page of your script eaten up with:
Hey there, Guy!
SOME OTHER GUY
Hey. It's been a while.
YET ANOTHER GUY
Well, then, I guess I'll be seeing you around...
It's sooo boring and it takes up such valuable real estate.
They'd always show him firing up his computer and then just typing in the words. No need for him to open a program or file on his completely unique OS, apparently.